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《Journal of Naval University of Engineering》 2010-01
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Seafloor characteristics of seismic wave caused by ship hydrodynamic pressure field

LU Zai-hua,ZHANG Zhi-hong,GU Jian-nong(College of Science,Naval Univ.of Engineering,Wuhan 430033,China)  
The seismic wave induced by the ship hydrodynamic pressure field was simplified to the seismic wave generated by a concentrated force applied in a liquid-solid multi-layered hemisphere.Based on the wave-amount integration technique,the curves of acoustic pressure,displacement and acceleration on the seafloor varying with frequency were obtained by FFP numerical evaluation technique.According to the calculated results,the frequency of the seismic wave induced by the ship hydrodynamic pressure is very low,or this kind of seismic wave is an ultra low frequency signal.The sound pressure,vertical acceleration and horizontal acceleration on the seafloor in frequency domain are characterized by a very low frequency value.
【Fund】: 国家部委基金资助项目(51303030501);; 海军工程大学自然科学基金资助项目(HGDJJ2007250213)
【CateGory Index】: P631.4
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